SIC time
There are only a few ways to log SIC, and whether a Part 91 Company has a policy to have two pilots fly does not enter into it whatsoever. The only way(s) to legally log SIC that Iam aware of are:
1) As a SIC in an aircraft whose type certificate requires a SIC, or
2) Under regulations that require a SIC.
For example, under Part 135 or 121, an aircraft in scheduled pax service with more than 9 pax seats requires a SIC. This SIC must have completed a prescribed amount of ground school and flight training for the company, and have taken a 135.293 checkride in the past 12 months.
Under Part 91, since a Safety pilot is a required crewmember when the sole manipulator is under a hood, you could log that time as SIC time if you really had some burning god-awful desire to put something in that SIC cloumn in your logbook, but most people designate the safety pilot as PIC and he logs it that way.
Not to muddy the waters too much, but you may be interested to know that there is actually a difference between ACTING as PIC and SERVING as PIC. That is fodder for another string, but basically, the Regs say that there must be a PIC designated for the flight, that person must meet certain recency of experience qualifications (IFR currency, or 3 takeoffs/ldgs in 90 days, for example) but that person may or may not manipulate the controls. You may have another pilot, actually fly the airplane. If the airplane is a C90 that does not require two pilots, the holder of a multi-engine rating could be PIC, SERVING as the sole manipulator, while the other pilot ACTS as PIC. Most people believe that although this sort of time may be legal, it is not very honest, and most airlines specifically state that all PIC time must be as the "signer for the aircraft" or the person ultimately responsible for the flight.
One more thing- to ACT as PIC of the King Air, you would also need to have a high altitude endorsement too. Technically, if the other pilot was fully current and qualified to ACT as PIC, and you had a multi-engine rating, you could SERVE as a PIC without the endorsement, simply logging it a PIC- sole manipulator, appropriately rated, but, again, most prospective employers will look down on ths type of time.
If it were me, I would simply log the time as "aircraft familiarization" and "aircraft training" and make an effort to learn about the aircraft- its numbers, operating limitations, normal, abnormal and emergency procedures- but I am sure you would do this anyway, as a future professional.
Check out 61.55 and 61.57 for further info, also FAR Part 1, definition, (pilot in command).
Good Luck!
